If an image is not for sale then the Purchase screen will simply display a message to that effect.
If the selected image is for sale however then this screen will display the print prices for the
image. Often the price of the first print is higher than the cost of successive (duplicate) prints
of the same image.
To order a print select the image size, quanitity etc. from the drop down lists and then press
the 'Add to Order' button. The image will then be added to your order and the
'Order' screen will be displayed.